The Seveso is a 55-kilometre (34 mi) Italian river that flows through the provinces of Como, Monza e Brianza and Milan. It rises on Sasso di Cavallasca or Monte Sasso of Cavallasca, near San Fermo della Battaglia. From here its course runs through the communes Montano Lucino, Grandate, Civello, Casnate con Bernate, Portichetto, Fino Mornasco, Cucciago, Vertemate con Minoprio, Asnago, Carimate, Cimnago, Lentate sul Seveso, Camnago, Barlassina, Seveso, Cesano Maderno, Binzago, Bovisio-Masciago, Varedo, Palazzolo Milanese, Paderno Dugnano, Cusano Milanino, Cormano, Bresso. Finally, at Milan, it joins with the canal called the Naviglio Martesana which flows into the Lambro.